Sea slugs mainly eat sea anemones, which are covered with stinging
cells that normally burst at the slightest touch, firing poison darts at the
creature which touched them. The sea slug, however, is able to tear sea anemones
apart and swallow the stinging cells without bursting them!

Even more amazing is what happens to the stinging cells when
they reach the sea slug’s stomach. There are tiny tubes lined with moving
cilia (hairs), which link the stomach to waving spurs on the sea slug’s
back. The sea anemone’s stinging cells—so fatal to other organisms—are
transported from the stomach, up those tiny tubes, to the tips of the spurs.
There the sea slug stores those stolen weapons to use in its own defence, shooting
them at any fish which dares to attack it!

Is it possible to imagine an evolutionary scenario for the development
of the sea slug’s amazing mechanisms? Let us suppose that at some time
in the past, a sea slug happened to attack and tear up a sea anemone without
getting a lethal dose of poisoned darts. Let us further suppose—against
all the odds—that it was somehow able to swallow the stinging cells without
bursting them.

Without those special tubes, and moving hairs, to transport
the stinging cells to the spurs on its back, the sea slug would have been doomed.
Every part of the sea slug’s complex mechanism had to be complete, right
from the beginning, to ensure its survival. Millions of years would make no
difference, because if the sea slug’s protective mechanisms were not
perfectly operating in its first attack on the sea anemone, it would have died.

In his Origin of Species, Charles Darwin wrote: ‘If it
could be demonstrated that any complex organ existed which could not have been
formed by successive, slight modifications, my theory would absolutely break
down.’

The sea slug leaves Darwin ‘s theory in ruins. The only
logical explanation for the origin of this amazing creature is special creation!